Pump for lubricants and the like



Oct 22, 1945 s. D. SHEARMAN PUMP FOR LUBRICANTS AND THE LIKE Filed May 23, 1945 In mw U2 Patented Oct. 22, 1946 Spicer D. Shearman, ryan, Ohio, assigner to The ArolEquipipept Corporation, Bryan, Ohio, a corporation vof Ohio Application Mayes, 1945, serialfNo; 595,419

e clanes. (01.'1403-55 My present invention `relates Vto a Apump Vfor lubricant andthe like having ya novel primer piston and pump plunger arrangement-, ne *obiefct VVci" 'the inventionjis `to provide a 4simple structure having means to both prime a pressure pump and 'at thesame time operate tliepressure pump by means of a "Singh reciprojcatigmticn fja. pump' Another .object is to "provide an "arrangement wherein prir piston is 'reciprocabl a 'cylinder and `in* the cylinder `a pump plunger is 'arranged, the primer piston having a cylinder to cooperateA therewith to pump lubricant at high pressure Vfrom the pump structure and to create 1.

a vacuum on the return stroke vwhich quickly sucks the lubricant brought to the `high pressure :pump by the primer `piston `into the. cylinder of the 4high pressure pump when it leaves the plunger. I 1

Another object is to provide an arrangementjof this character in which the piston rod Ais hollow so that the lubricant under high pressuremay pass up through it to the discharge port of the pump.

A further object is to' provide a simple arrangement which involves few parts and but little assembly labor rfor fabricating a pump structure including a means to prime the pump. f

With these and other objects Vin view, my invention consists in the construction, arrangement and `combination of the various parts `of my y'device whereby the objects'contemplated are attained, .as hereinafter l"more fully set 4forth, pointed out in my claims and illustrated in the accompanying drawing, wherein: 1

Fig.` l is Ya vertical, sectional View `through ya pump for lubricant and the 'like'emb'cdying m'y invention, and-showing the `primer piston inlowered position; 1

Fig. 2 is enlarged sectional View of the pump mechanism per se showing the primer piston in elevated position; and

Fig. 3 is a bottom plan view of Fig. 2.

On the accompanying drawing I have used the reference numeral I to indicate a tubular container having a bottom I2. A lid lli is provided for the container IU and it may be secured to the container as by means of clamp screws I6 and I8 coacting with b-rackets 20 and 22 on the tank and brackets 24 and 26 on the lid. The clamp screw I has a wing nut 28 and the clamp screw I8 has a sleeve nut 38 threaded thereon, as illustrated.

A pump head 32 is mounted on the lid I4 as by fro 2 bolts 34 an'dhas a tubular'liousing 36 depending therefrom into the container In. Anjextesion tube 38 is also provide'dwhich serves as a primer cylinder and it is `coupled to the tube 36 by va nipple 40. I

Within the primer cylinder 38 awp'iston 42 iof cup leather type is reciprocable. Itis 'supported by the lower end of a high pressure cylinder 44 which has a head 48. The head 46 contains an outlet valve seat 48 against which a check valve 5l)v of ball type is adaptedt normally seat.

The head 44 is connected at Eits upper end with a tubular rod 52 which is threaded into 'the `lower vend of a piston rod 54. The piston rod54 has a bore 56 part way into `it `fror'n the lower end, and this tbore communicates by meansf a side loutlet 58 with a cavity 68 in the vhead 32..

The cavity 68 communicates with an outlet port 462 which extendsto the point of use/'such a'sthe usual grease hose ending in fa discharge. nozzle, which may or may not be Vthe valved type, as desired.

A packing gland 64 surrounds the piston Vrod 54 for retaining packing l66 in the lower end of the head 32 to avoid leakage between the head and the piston rod. The tube 36 has' breather openings 68, the purpose of which will hereinafter appear. I

For` reciprocatmgthe piston rod 54 I, provide a handlever'l pivbtedtothe head`3'2 by means of a link 12. The lever 'l0 'carries a pivot pin 'I4 with which the upper end of the rod 54 is connected after extending out of the head through a packing nut 16.

The high :pressure cylinder 44 is adapted to coact at times with a high pressure plunger 'I8 which has a shouldered down 1portion'8ll fsupvported in a hub-82. The hub 82 isconnected by spokes 84 with `an annular member 86. The member 86 is connected with the lower end ofzthe plunger cylinder 38 by means of a connector -ring 88 having its upper and lower ends flanged over as shown in Fig. 2. The shouldered down portion is retained in the vhub 82 by a nut 90.

Freely slidable on the tubular housing 36 and in the cylinder 38 is a hub 92 and a cone-shaped follower plate 94. The plate 94 is adapted to follow the lubricant 96 in the container II) and has a peripheral ilange 98 extending upwardly. The flange 98 occupies a position close enough to the wall of the container I0 toclean the lub-ricant from the wall with the exception of a thin film.

Practical operation.

In the operation of my pump structure, the

cylinder 44 and the plunger 18 together constitute a high pressure pump, whereas the piston 42 and the cylinder 38 constitute a primer therefor. Beginning with the lower end of the stroke, as in Fig. 1, it will be obvious that there is no pumping action within the cylinder 44 when the direction of reciprocation is reversed and the cylinder 44 is moved"Qupwardly.v :The check' valve 50 will close from the position of Fig. 1 to the position of Fig. 2 as soon as such movement is started, and the plunger will accordingly produce a vacuum within the cylinder 44. At the same time, the upward movement of the piston 42 draws lubricant in through the ring 86 betw'een'the'y spokes 84v -f thereof for charging the space within the cylinder 38 surrounding the plunger '18 when the lower end of the piston 42 leaves the upper end of the plunger 18. The vacuum in the cylinder 44 will at that time draw a charge of lubricant up into the cylinder.

L Upon the down stroke this charge of lubricant willbe trapped in the cylinder 44 by the plunger 18, .and will be displaced therefrom through the check valve 50 andinto the tubular piston rod 52. The lubricant passing through the check valve 5l) will displace any lubricant above it upwardly through the. bore 56 of the piston rod- .54, then outwardly through its port 58 into the cavity 60, and from there through the discharge opening 62 into the lubricant hose.

From the foregoing descriptionV it will be obvious-that I haveprovided an element 44-42 which servesboth as a high pressure cylinder and a primer piston. When Athis element is reciprocated, it primes the high pressure pump and by cooperation of yits cylinder with the plunger '18,

the lubricant is dispensed at a pressure depending upon thearea of the plunger 18 in relation to the pressure on the handlel. The high pressure pump is effectively and efficiently primed each time the cylinder 44 leaves the upper endof the plunger 18, thus eliminating all voids inthe stream of lubricant being dispensed.

Some changes may be made in the construction'and arrangement of the parts of my device without departing from the real spirit and purpose of my invention, and it is my intention to cover .by my claims any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope.

I claim as my invention: Y

1. In a pump for lubricant and the like, a primer cylinder, a primer piston movable therein, a pump cylinder carried by said primer piston, a pump plunger carried by said primer cylinder, said pump cylinder being movable onto and oiT of said pump plunger, said primercylinder'and pump cylinder communicating freelyzwith each other when 4the pump cylinder is 4off the pump plunger, an outlet check valve carried by said pump cylinder, and a tubular lpiston `rod consaid ipump cylinder being movable onto and olf of said pump plunger, said primer cylinder and pump cylinder communicating freely with each Y other when the pump cylinder is oir the pump plunger, and an'outlet check valve carried by said pump cylinder.

3. In a pump of the character disclosed, a primer cylinder', a primer piston movable therein, a stationary pump plunger, a pump cylinder simultaneously movable with said primer piston and being movable onto and off of said pump plunger, said primer cylinder and pump cylinder communicating freely with each other when the pump cylinder-is offy the pump plunger, and a tubular piston rod connected with said pump-,cylinder for operating it and said primer piston and for receiving the lubricant therefrom and discharging it from the pump. j Y.

4.,In a pump structure, a cylinder, a primer piston reciprocable therein,"a plunger'ca'rried by said cylinder, said piston havinga k,cylinder co'- operable with said plunger to pump liiuid,v a piston rod 'for reciprocating said primer; piston and said' pump cylinder, to provide Vsuction and discharge-strokes, said cylinders being in free conimunication with each other at the end of a suction stroke, and an outlet check valve carried by said pump cylinder.

5. In'a vpump structure, a cylinder, a piston reciprocable therein, a plunger carried by said cylinder, said piston being hollow to receive said plunger and cooperate therewith to pump iiuid, apiston rod for reciprocating said piston and said pump'cylinder, to provide suction and discharge strokes, said cylinder and the hollow portion of said piston being in free communication with each other at the end of a suction stroke, and an outlet check valve carried by said pump cylinder, said piston rodibeing hollow and the outlet side of said check vvalve communicating therewith.

6. In apump structure, a cylinder, a primer piston reciprocable therein, a spider at the lower end of said cylinder, a plunger carried by said spider, said piston having a bore cooperable with said plunger to'pump iiuid, a piston rod for reciprocating said primer piston, to provide Ysuction and discharge strokes, said cylinder and said bore beingV in free communication with each other at the end of a suction stroke, andan outlet check valve carried by said primer piston andV communicating with said bore. r ,I

SPICER D. SHEARMAN. 

